Apparatus and averaging method for equalizing signals

a technology of equalizing signals and averaging methods, applied in the field of methods and apparatus for adaptive equalizing signals, can solve the problems of reducing costs and lowering power consumption, and achieve the effect of reducing power consumption

Active Publication Date: 2005-12-13
NAT SEMICON CORP
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Benefits of technology

[0007]In accordance with the present invention, an adaptive equalizer and amplitude control system adjusts equalization gain levels and amplitude levels of an incoming signal using an averaging algorithm. The system ope

Problems solved by technology

Since the equalization system uses the incoming data signal to generate the requisite timing signals for sampling and control, hig

Method used

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  • Apparatus and averaging method for equalizing signals
  • Apparatus and averaging method for equalizing signals
  • Apparatus and averaging method for equalizing signals

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Embodiment Construction

[0027]Throughout the specification, and in the claims, the term “connected” means a direct electrical connection between the things that are connected, without any intermediary devices. The term “coupled” means either a direct electrical connection between the things that are connected, or an indirect connection through one or more passive or active intermediary devices. The term “circuit” means one or more passive and / or active components that are arranged to cooperate with one another to provide a desired function. The term “signal” means at least one current signal, voltage signal or data signal.

[0028]The present invention relates to a data receiver that receives an input signal. The data receiver includes an equalizer and various electronic circuits that control the equalizer. The electronic circuits adjust the equalization level based upon the received input signal. Digital control logic is utilized to change various control signals to adjust the equalization level. A peak dete...

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Abstract

An adaptive equalizer system and method uses an averaging algorithm to adjust equalization and amplitude for a data signal. Two sampled data points, spanning a sampling window, are obtained from the equalized signal. The data points are evaluated to determine when a signal condition persists long enough to require equalization adjustment, as well as evaluating persistent conditions in the amplitude of the received data signal. By monitoring persistent conditions in the equalized signal, the average signal received by the equalizer is compensated. The bit resolution of the equalizer control and the amplitude control can be selected for a desired resolution in a system. The incoming data signal is used to generate the requisite timing signals for sampling and control such that high frequency clock circuits and PLL techniques are unnecessary resulting in lower power consumption and reduced costs.

Description

FIELD OF THE INVENTION[0001]The present invention relates to a method and apparatus for adaptively equalizing a signal at high data rates. In particular, the present invention relates to a method and apparatus that includes an equalizer circuit that has an adjustable gain, and a combination of analog and digital circuits that are arranged to control the adjustable gain to provide equalization and amplitude control of a signal.BACKGROUND OF THE INVENTION[0002]Data signals are degraded when transmitted over long lengths of cable. As the frequency of the data signal increases, the adverse effects on signal quality become more prevalent in the received signal. The data signal will become degraded in amplitude due to loss and phase dispersion from the cable.[0003]Digital data signals consist of an infinite series of frequency components. High frequency digital data signals have very fast edges resulting in larger amplitudes in the high frequency components of the signal. Since the loss i...

Claims

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Application Information

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IPC IPC(8): H03H7/30H04B3/14H04L25/03
CPCH04B3/143H04L25/03885
Inventor LE, VUONG KIMNGUYEN, HAI THANHCHANDRASEKARAN, SUSHMAYANG, YU-SHENG
Owner NAT SEMICON CORP
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